If you mean the PSP (Pierced Steel Planking), then this is available in photo-etch form and resin, the latter being, I think, from Verlinden. The photo-etch looks ok but, as far as I've seen to date, it isn't '3D'.
If on the other hand you mean the 'mesh' type, such as Sommerfeld matting, then this can easily be made from the fine net used in bridal veils, curtains etc, available from most haberdashery or fabrics shops.
Hope this helps.